Fall back to a council select list on the flat site

When we get a request from the mirrorer to a licence, or a local transaction, we will show a message informing users to contact their council.

Additionally, if the user has JavaScript enabled, we'll show a select box containing every council which, once selected, will take the user to the location-based page for the edition.

Also fixes a few issues with authority slugs where there was a hyphen in the original name of the council (e.g Barrow-in-Furness, Stoke-on-Trent)

Note: we still do need to specify some way of getting the mirrorer to index the location-based pages we're redirecting users to in this - e.g. /find-your-local-park/camden